2003 YAMAHA YZ250LC ignition

6-6
IGNITION SYSTEMELEC
3. Inspect:
9Source coil 2 resistance
Out of specification Replace.
EC628000
CDI UNIT INSPECTION
Check all electrical components. If no fault is
found, replace the CDI unit. Then check the
electrical components again.
Tester (+) leadGreen/Blue lead 1
Tester (–) lead
Green/White lead 2
Source coil 2 Tester selector
resistance position
44~66Ωat
Ω× 10
20°C (68°F)
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6-7
SOLENOID VALVE SYSTEMELEC
Check solenoid
valve operation.
Solenoid valve
coil
No good
No good
Check each couplers and
wire connection.
Check solenoid valve.
Repair or replace.
Replace.
Replace.
OK
OK
OKSource coil
No goodReplace.* Check CDI magneto.
Replace CDI unit.
No good
EC650001
SOLENOID VALVE SYSTEM
EC651032
INSPECTION STEPS
If the solenoid valve will not operate, use the following inspection steps.
* marked: Refer to "IGNITION SYSTEM" section.
NOTE:
9Remove the following parts before inspection.
1) Seat
2) Fuel tank
9Use l2V battery in this inspection.
9Use the following special tools in this inspection.
Pocket tester:
YU-3112-C/90890-03112
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6-9
TPS (THROTTLE POSITION SENSOR) SYSTEMELEC
Check entire ignition
system for connection.Repair or replace.
OK
OKTPS coil
No goodReplace.Check TPS.
OKSource coil
No goodReplace.*Check CDI magneto.
TPS input
voltageNo goodReplace.Check CDI unit.
No good
EC690000
TPS (THROTTLE POSITION SENSOR) SYSTEM
EC691001
INSPECTION STEPS
If the TPS will not operate, use the following inspection steps.
*marked: Refer to “IGNITION SYSTEM” section.
NOTE:
9Remove the following parts before inspection.
1) Seat
2) Fuel tank
9Use the following special tools in this inspection.
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113Pocket tester:
YU-3112-C/90890-03112
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